/*********************************************************************
 * Copyright (C) 2003 Andrew Khan
 * <p>
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * <p>
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * <p>
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ***************************************************************************/

package jxl.biff.drawing;

import jxl.biff.IntegerHelper;
import jxl.common.Logger;

import java.util.ArrayList;

/**
 * Dgg record
 */
class Dgg extends EscherAtom {
    /**
     * The logger
     */
    private static Logger logger = Logger.getLogger(Dgg.class);

    /**
     * The binary data
     */
    private byte[] data;

    /**
     * The number of clusters
     */
    private int numClusters;

    /**
     * The maximum shape id
     */
    private int maxShapeId;

    /**
     * The number of shapes saved
     */
    private int shapesSaved;

    /**
     * The number of drawings saved
     */
    private int drawingsSaved;

    /**
     * The clusters
     */
    private ArrayList clusters;

    /**
     * The cluster structure
     */
    static final class Cluster {
        /**
         * The drawing group id
         */
        int drawingGroupId;

        /**
         * The something or other
         */
        int shapeIdsUsed;

        /**
         * Constructor
         *
         * @param dgId the drawing group id
         * @param sids the sids
         */
        Cluster(int dgId, int sids) {
            drawingGroupId = dgId;
            shapeIdsUsed = sids;
        }
    }

    /**
     * Constructor
     *
     * @param erd the read in data
     */
    public Dgg(EscherRecordData erd) {
        super(erd);
        clusters = new ArrayList();
        byte[] bytes = getBytes();
        maxShapeId = IntegerHelper.getInt
                (bytes[0], bytes[1], bytes[2], bytes[3]);
        numClusters = IntegerHelper.getInt
                (bytes[4], bytes[5], bytes[6], bytes[7]);
        shapesSaved = IntegerHelper.getInt
                (bytes[8], bytes[9], bytes[10], bytes[11]);
        drawingsSaved = IntegerHelper.getInt
                (bytes[12], bytes[13], bytes[14], bytes[15]);

        int pos = 16;
        for (int i = 0; i < numClusters; i++) {
            int dgId = IntegerHelper.getInt(bytes[pos], bytes[pos + 1]);
            int sids = IntegerHelper.getInt(bytes[pos + 2], bytes[pos + 3]);
            Cluster c = new Cluster(dgId, sids);
            clusters.add(c);
            pos += 4;
        }
    }

    /**
     * Constructor
     *
     * @param numShapes the number of shapes
     * @param numDrawings the number of drawings
     */
    public Dgg(int numShapes, int numDrawings) {
        super(EscherRecordType.DGG);
        shapesSaved = numShapes;
        drawingsSaved = numDrawings;
        clusters = new ArrayList();
    }

    /**
     * Adds a cluster to this record
     *
     * @param dgid the id
     * @param sids the sid
     */
    void addCluster(int dgid, int sids) {
        Cluster c = new Cluster(dgid, sids);
        clusters.add(c);
    }

    /**
     * Gets the data for writing out
     *
     * @return the binary data
     */
    byte[] getData() {
        numClusters = clusters.size();
        data = new byte[16 + numClusters * 4];

        // The max shape id
        IntegerHelper.getFourBytes(1024 + shapesSaved, data, 0);

        // The number of clusters
        IntegerHelper.getFourBytes(numClusters, data, 4);

        // The number of shapes saved
        IntegerHelper.getFourBytes(shapesSaved, data, 8);

        // The number of drawings saved
        //    IntegerHelper.getFourBytes(drawingsSaved, data, 12);
        IntegerHelper.getFourBytes(1, data, 12);

        int pos = 16;
        for (int i = 0; i < numClusters; i++) {
            Cluster c = (Cluster) clusters.get(i);
            IntegerHelper.getTwoBytes(c.drawingGroupId, data, pos);
            IntegerHelper.getTwoBytes(c.shapeIdsUsed, data, pos + 2);
            pos += 4;
        }

        return setHeaderData(data);
    }

    /**
     * Accessor for the number of shapes saved
     *
     * @return the number of shapes saved
     */
    int getShapesSaved() {
        return shapesSaved;
    }

    /**
     * Accessor for the number of drawings saved
     *
     * @return the number of drawings saved
     */
    int getDrawingsSaved() {
        return drawingsSaved;
    }

    /**
     * Accessor for a particular cluster
     *
     * @param i the cluster number
     * @return the cluster
     */
    Cluster getCluster(int i) {
        return (Cluster) clusters.get(i);
    }
}
